Year	current US$
1971	175.5797885295445
1972	191.35938368669434
1973	238.58130195487334
1974	290.48049330442706
1975	312.09355962249055
1976	327.01288409020657
1977	335.8537711872869
1978	369.2388598813546
1979	403.06225475988475
1980	526.222742107111
1981	813.2089162890225
1982	723.409680572307
1983	606.5102310236346
1984	512.1230955886205
1985	451.6415804375705
1986	449.51824223212674
1987	489.7559476738229
1988	502.08282799358955
1989	473.3689894760608
1990	519.810335256057
1991	531.8502934956919
1992	514.5297510920353
1993	466.6238672661059
1994	442.1432526976629
1995	503.45958121414964
1996	510.08256378476943
1997	518.8893565116235
1998	495.33514775796937
1999	493.6167638519553
2000	487.0381825381712
2001	455.915451566865
2002	486.6442707149085
2003	599.7515977285601
2004	723.5277340949228
2005	820.6943861334343
2006	958.6042291598875
2007	1047.913079405342
2008	1115.9043615538344
2009	1116.4357311407914
2010	1253.0174745883057
2011	1353.9769400441676
2012	1399.955789205424
2013	1470.1025341348734
2014	1544.103479338012
2015	1379.5406479514793
2016	1260.5706333214403
2017	1313.1901517712852
2018	1319.4315994580393
2019	1313.8986830575755
2020	1228.8056819274882
2021	1306.186268828245